Abstract:

The liquid dehumidifiers are the key unit for liquid desiccant cooling system(LDCS)and the internal heat and mass transfer of dehumidifier have important influence on the performance of LDCS.Based on the adiabatic dehumidification model, a new model considering non-thermal equilibrium was put forward to evaluate heat and mass transfer coefficients.By simulation calculation, it is found that the outlet parameters of air and liquid from non-thermal equilibrium model agree well with the experimental values, so that the model is better to evaluate heat and mass transfer coefficients.When the heat capacity rate ratio C^*≥1.0, the calculation results for the number of mass transfer units and Lewis factor from non-thermal equilibrium model are much better than those from the adiabatic model, while the two models give almost the same results when C^*≤0.05.

摘要：

溶液除湿装置是溶液除湿空调系统中一个重要单元，其内部传热传质规律对系统性能起到决定性影响。在溶液绝热除湿模型基础上，提出考虑热不平衡的除湿模型用以计算溶液除湿过程的传热传质系数。模拟计算发现考虑热不平衡模型计算的溶液和空气出口参数与实验值能更好吻合，从而说明该模型能更准确计算除湿过程传热传质系数。当热容率比C^*≥1.0时，考虑热不平衡除湿模型计算的传质单元数和Lewis数要远优于绝热模型计算结果；而当C^*≤0.05时，考虑热不平衡除湿模型和绝热模型计算结果相差较小。